I don't know if it adds "nothing" to the summons. I bought a raven familiar into the druid camp, and I thought it was pretty cool how all the kid characters seemed to get fascinated by it and follow me around asking if they could pet it.
But this reaction also didn't seem so bad; because they'd go back to where they usually stood, eventually, and there seemed to be some sort of cooldown timer set where if they had followed me once, they wouldn't follow me again for a while.
Maybe the summon reaction to other things isn't working fully as intended; I did notice problems with a summoned elemental in last light's inn. I would say that maybe a horrified reaction is justified if you're touting around a bunch of undead....but then again there's a Circus in Baldur's Gate that has undead just hanging around on the streets smelling people's brains and nobody seems all that disturbed. Maybe limit the reaction just to having people make comments about your summons, and have them go back to their spots in a similar manner that the kids in the druid's grove do.
